These 7440 single filament LED bulbs can only be used for front or rear turn signal lights

No good for constantly lighting up

Any misuse of this product will avoid its warranty

This LED bulb is two times longer than the stock bulb. In order to install this LED bulb, please make sure you measure your turn signal lamp housing as it needs to be deep enough with enough clearance space in the back.

This LED bulb 7440 (3.10") will replace the original bulb size 7441 7444 7440A 992 W21W used for the single filament purpose for turn signal light only

A: This LED bulb will replace the original bulb size 7440 7441 7440A 992 W21W used for the single filament purpose for turn signal light only:

Q: Why does this LED bulb comes
with wire?

A: The wire is used to connect
to decoder in order to bypass the on board computer check. These
LED bulbs not only will be completely error free, but also resolve
the hyper flash issue. Here is a YouTube video showing you how to
install this product, please take a look. Remember the wire connects
to the decoder is very thin, so twist slowly and gently.

Q: Where do I put the decoder
for this Error Free LED bulb?

A: Please mount the decoder to
metal.

Q: Can I use these Error Free 3357/3457 LED bulbs for any other cars other than BMW or Mercedes?

A: Unfortunately, these Error Free LED bulbs will only fit BMW or Mercedes which use 3357 or 3457 bulbs as a single filament function
front turn signal lights (on/off/on/off). Because of this reason, the LED bulbs are actually single filament and will not work for any other vehicles nor any
double-filament turn signal light purpose.

Q: Why do I have to measure the depth of the turn signal light housing?

A: Since this 30W CREE 7440 LED bulb is extremely long (twice longer than the stock 7440 bulb), so you need to measure the depth inside the turn signal lamp, make sure it is long/deep enough in order to fit in this kind of LED bulb. Also you want to make sure there's enough space (needs also around 3.1") on the back of the turn signal lamp in
order to insert this kind of LED bulb. (if the space on the back of the turn signal lamp is limited, you can almost loose or even remove the headlamp or tail lamp to install these LED bulbs)

Q: Are there any prerequisites regarding the housing prior to installation?

Since the bulb is 3.10" long, please make sure the turn signal light housing is deep enough to accommodate this extremely long LED bulb.

The housing also cannot have the bulb glare shield (circled in red) in front as it will obstruct the installation.

Q: How come the LED bulb
flickers/strobes a couple times when I just start the engine?

A: This symptom
is
completely normal when installing any LED bulb for an
European cars such as Audi, BMW, Mercedes-Benz, Porsche, Volkswagen,
etc. This temporary flickering is caused by European cars' on
board computer sending a routine check electrical impulse when first
start the engine to all the bulbs and lamps to make sure they are
not burnt out. Since LED bulbs are super sensitive to power, it
will cause the LED bulb to respond and light up.

This revolutionary US patent pending design allows you to convert the single-filament 7440 turn signal lamp incandescent bulbs to LED without worrying about the annoying hyper flash problem.

However, this LED bulb is twice longer than the stock 7440/992A bulb. Before buying this product, you must measure your turn signal lamp housing, it has to been deep enough (3.1") in order to install this kind of LED bulb.

Very satisfied with the LED turn signal lights. I installed it on my Honda Accord 2009. A bit bigger than OEM bulb, but easy to install! SUPER BRIGHT!

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1 of 1 people found this product review helpful:

Fits 2012 Prius

August 28, 2015

Reviewer:
C Ang from Toronto, ON Canada

These fit my 2012 Prius easily, for front & rear turns.. The illumination was so effective, the sides of my rear turns were lighting up too, and remember the Prius has sharp cornered turn signals.. There was a hyper flash problem on my Canadian Prius due to the DRL circuit, this is easily solved by an LED Flasher Relay or Load Resistors.. The relay is a tougher install to reach, BUT it's a cleaner wiring install than having 2 Load Resistors mounted near your turn signals.. The LED Flasher is lighter than 4 Load Resistors too... Minor nitpick is the length of these causes the light source to move outward away from the reflectors.. So on the rear turns, it looks like a point light source than an entire reflector lighting up.. This is not a problem with the front turns because the lamp is so long it's pushed to the corner of the front turns, and the point light source is masked by the corner prisms.. Very bright and increases your turn signal visibility.. Nice amber tone, not yellow..

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